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2.0
Dec 30, 2019
12/19
by
Paul Hobson
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Director of Modern Art Oxford, Paul Hobson, shares his experiences studying Modern History at Brasenose College and talks about how he transitioned into a career in contemporary art. Director of Modern Art Oxford, Paul Hobson, shares his experiences studying Modern History at Brasenose College and talks about how he transitioned into a career in contemporary art. As well as reading Modern History at Oxford University, Paul also completed post-graduate studies in aesthetics and contemporary...
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13
Aug 3, 2017
08/17
by
Hobson, Paul D., 1921-
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Topics: Lubrication and lubricants, Lubrication and lubricants, Teoria Da Lubrificacao
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9.0
Jul 16, 2019
07/19
by
Hobson, Paul Alexander Robert, 1953-
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47 p. ; 23 cm
Topics: Local government -- Canada, Provincial-local fiscal relations -- Canada, Provincial-local relations...
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1.0
Aug 7, 2019
08/19
by
Hobson, Paul A. R. (Paul Alexander Robert), 1953-
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9 pages ; 28 cm
Topics: Public goods -- Mathematical models, Local finance -- Mathematical models, Local finance --...
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1.0
Apr 22, 2019
04/19
by
Hobson, Paul A. R. (Paul Alexander Robert), 1953-
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v, 82 p. : 23 cm
Topic: Federal-provincial fiscal relations -- Canada
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3.0
Jun 30, 2018
06/18
by
Lindley Lentati; Michael P. Hobson; Paul Alexander
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We introduce a method for performing a robust Bayesian analysis of non-Gaussianity present in pulsar timing data, simultaneously with the pulsar timing model, and additional stochastic parameters such as those describing red spin noise and dispersion measure variations. The parameters used to define the presence of non-Gaussianity are zero for Gaussian processes, giving a simple method of defining the strength of non-Gaussian behaviour. We use simulations to show that assuming Gaussian...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1405.2460
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4.0
Jun 30, 2018
06/18
by
Lindley Lentati; Peter H. Sims; Chris Carilli; Michael P. Hobson; Paul Alexander; Paul Sutter
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We introduce a new method for performing robust Bayesian estimation of the three-dimensional spatial power spectrum at the Epoch of Reionization (EoR), from interferometric observations. The versatility of this technique allows us to present two approaches. First, when the observations span only a small number of independent spatial frequencies ($k$-modes) we sample directly from the spherical power spectrum coefficients that describe the EoR signal realisation. Secondly, when the number of...
Topics: Cosmology and Nongalactic Astrophysics, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1701.03384
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156
Dec 15, 2015
12/15
by
Hobson, Barbara Meil; Wright, Paul M., joint author; Boston Public Library
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Held April 1975-Dec. 1976 at the Boston Public Library
Topic: American literature
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43
Sep 22, 2013
09/13
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Lindley Lentati; Paul Alexander; Michael P. Hobson; Stephen Taylor; Jonathon Gair; Sreekumar T. Balan; Rutger van Haasteren
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A new model independent method is presented for the analysis of pulsar timing data and the estimation of the spectral properties of an isotropic gravitational wave background (GWB). We show that by rephrasing the likelihood we are able to eliminate the most costly aspects of computation normally associated with this type of data analysis. When applied to the International Pulsar Timing Array Mock Data Challenge data sets this results in speedups of approximately 2 to 3 orders of magnitude...
Source: http://arxiv.org/abs/1210.3578v2
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42
Mar 14, 2018
03/18
by
Baz Luhrmann; Bazmark; Christine Anu; David Hobson; Doris Day; Gavin Friday; Gustav Holst; Helena; Jack Hylton & His Orchestra; John Paul Young; Kym Mazelle; Lani; Quindon Tarver; Royce Doherty; Snooper; Stanley Black; Tara Morice
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Tracklist: 1. Bazmark Fanfare - Bazmark 2. Young Hearts Run Free (The Overture mix) - Kym Mazelle 3. Lovefool (Snooper version) - Snooper 4. Perhaps Perhaps Perhaps - Doris Day 5. Everybody’s Free (to Wear Sunscreen) Mix - Quindon Tarver 6. Che Gelida Manina (Your Tiny Hand Is Frozen) - David Hobson 7. When Doves Cry (extended mix) - Quindon Tarver 8. Love Is in the Air (Fran mix) - John Paul Young 9. NUTBOD (Houseboats of Kashmir mix) - Christine Anu; Royce Doherty 10. Happy Feet (High Heels...
Source: CD
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66
Dec 21, 2017
12/17
by
Baz Luhrmann; Christine Anu; David Hobson; Doris Day; Gavin Friday; Gustav Holst; Helena; Jack Hylton; John Paul Young; Kym Mazelle; Lani; Quindon Tarver; Royce Doherty; Snooper; Stanley Black; Tara Morice; The Australian Opera and Ballet Orchestra
audio
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Tracklist: 1. Bazmark Fanfare - Kym Mazelle 2. Young Hearts Run Free (The Overture mix) - Kym Mazelle 3. Lovefool (Snooper version) - Snooper 4. Perhaps, Perhaps, Perhaps - Doris Day 5. Time After Time (The S.F.E. version) - Tara Morice 6. Che Gelida Manina (Your Tiny Hand Is Frozen) - David Hobson; The Australian Opera and Ballet Orchestra 7. When Doves Cry (extended mix) - Quindon Tarver 8. Love Is in the Air (Fran mix) - John Paul Young 9. NUTBOD (Houseboats of Kashmir mix) - Christine Anu;...
Source: CD
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45
Sep 21, 2013
09/13
by
Natasha Hurley-Walker; A. M. M. Scaife; D. A. Green; Matthew L. Davies; Keith Grainge; Michael P. Hobson; Michael E. Jones; Tak Kaneko; Anthony Lasenby; Guy Pooley; Richard D. E. Saunders; Paul F. Scott; David Titterington; Elizabeth Waldram; Jonathan T. L. Zwart
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We present observations between 14.2 and 17.9 GHz of 12 reported supernova remnants (SNRs) made with the Arcminute Microkelvin Imager Small Array (AMI SA). In conjunction with data from the literature at lower radio frequencies, we determine spectra of these objects. For well-studied SNRs (Cas A, Tycho's SNR, 3C58 and the Crab Nebula), the results are in good agreement with spectra based on previous results. For the less well-studied remnants the AMI SA observations provide higher-frequency...
Source: http://arxiv.org/abs/0902.1420v1
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64
Sep 22, 2013
09/13
by
AMI Consortium; :; Michel P. Schammel; Farhan Feroz; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Yvette C. Perrott; Guy G. Pooley; Carmen Rodriguez-Gonzalvez; Clare Rumsey; Richard D. E. Saunders; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram
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We present 16-GHz Sunyaev-Zel'dovich observations using the Arcminute Microkelvin Imager (AMI) and subsequent Bayesian analysis of six galaxy clusters at redshift ($z \approx 1$) chosen from an X-ray and Infrared selected sample from Culverhouse et al. (2010). In the subsequent analysis we use two cluster models, an isothermal \beta-model and a Dark Matter GNFW (DM-GNFW) model in order to derive a formal detection probability and the cluster parameters. We detect two clusters (CLJ1415+3612...
Source: http://arxiv.org/abs/1210.7771v2
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49
Sep 23, 2013
09/13
by
AMI Consortium; :; Natasha Hurley-Walker; Matthew L. Davies; Thomas M. O. Franzen; Keith Grainge; D. A. Green; Michael P. Hobson; Anthony Lasenby; Guy Pooley; Carmen Rodríguez-Gonzálvez; Richard D. E. Saunders; A. M. M. Scaife; Paul F. Scott; Timothy Shimwell; David Titterington; Elizabeth Waldram; Jonathan T. L. Zwart
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We present observations between 1.4 and 18 GHz confirming that G64.5+0.9 is new Galactic shell supernova remnant, using the Very Large Array and the Arcminute Microkelvin Imager. The remnant is a shell ~8 arcmin in diameter with a spectral index of alpha = 0.47 +/- 0.03 (with alpha defined such that flux density S varies with frequency nu as S proportional to nu to the power of -alpha). There is also emission near the centre of the shell, ~1 arcmin in extent, with a spectral index of alpha =...
Source: http://arxiv.org/abs/0903.4317v1
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Sep 19, 2013
09/13
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Christopher T. Tibbs; Robert A. Watson; Clive Dickinson; Rodney D. Davies; Richard J. Davis; Carlos del Burgo; Thomas M. O. Franzen; Ricardo Génova-Santos; Keith Grainge; Michael P. Hobson; Carmen P. Padilla-Torres; Rafael Rebolo; Jóse Alberto Rubiño-Martín; Richard D. E. Saunders; Anna M. M. Scaife; Paul F. Scott
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The dust feature G159.6--18.5 in the Perseus region has previously been observed with the COSMOSOMAS experiment \citep{Watson:05} on angular scales of $\approx$ 1$^{\circ}$, and was found to exhibit anomalous microwave emission. We present new observations of this dust feature, performed with the Very Small Array (VSA) at 33 GHz, to help increase the understanding of the nature of this anomalous emission. On the angular scales observed with the VSA ($\approx$ 10 -- 40$^{\prime}$), G159.6--18.5...
Source: http://arxiv.org/abs/0909.4682v1
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Sep 19, 2013
09/13
by
Anna M. M. Scaife; Emily I. Curtis; Matthew Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Guy G. Pooley; Carmen Rodríguez-Gonzálvez; Richard D. E. Saunders; Michel Schammel; Paul F. Scott; Timothy Shimwell; David Titterington; Elizabeth Waldram; Jonathan T. L. Zwart
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We perform deep 1.8 cm radio continuum imaging towards thirteen protostellar regions selected from the Spitzer c2d small clouds and cores programme at high resolution (25") in order to detect and quantify the cm-wave emission from deeply embedded young protostars. Within these regions we detect fifteen compact radio sources which we identify as radio protostars including two probable new detections. The sample is in general of low bolometric luminosity and contains several of the newly...
Source: http://arxiv.org/abs/1009.0348v1
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Sep 19, 2013
09/13
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Ricardo Genova-Santos; Jose Alberto Rubino-Martin; Rafael Rebolo; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Nelson Falcon; Keith Grainge; Carlos M. Gutierrez; Michael P. Hobson; Michael E. Jones; Ruediger Kneissl; Katy Lancaster; Carmen P. Padilla-Torres; Richard D. E. Saunders; Paul F. Scott; Angela C. Taylor; Robert A. Watson
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We present interferometric imaging at 33 GHz of the Corona Borealis supercluster, using the extended configuration of the Very Small Array. A total area of 24 deg^2 has been imaged, with an angular resolution of 11 arcmin and a sensitivity of 12 mJy/beam. The aim of these observations is to search for Sunyaev-Zel'dovich (SZ) detections from known clusters of galaxies in this supercluster and for a possible extended SZ decrement due to diffuse warm/hot gas in the intercluster medium. We measure...
Source: http://arxiv.org/abs/astro-ph/0507285v1
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47
Sep 22, 2013
09/13
by
Anna M. M. Scaife; Jennifer Hatchell; Matthew Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Yvette C. Perrott; Guy G. Pooley; Carmen Rodríguez-Gonzálvez; Richard D. E. Saunders; Michel P. Schammel; Paul F. Scott; Timothy Shimwell; David Titterington; Elizabeth Waldram
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We present deep radio continuum observations of the cores identified as deeply embedded young stellar objects in the Perseus molecular cloud by the Spitzer c2d programme at a wavelength of 1.8 cm with the Arcminute Microkelvin Imager Large Array (AMI-LA). We detect 72% of Class 0 objects from this sample and 31% of Class I objects. No starless cores are detected. We use the flux densities measured from these data to improve constraints on the correlations between radio luminosity and bolometric...
Source: http://arxiv.org/abs/1101.5514v2
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44
Sep 22, 2013
09/13
by
The AMI Consortium; :; Natasha Hurley-Walker; Michael L. Brown; Matthew L. Davies; Farhan Feroz; Thomas M. O. Franzen; Keith Grainge; Michael P. Hobson; Anthony Lasenby; Malak Olamaie; Guy Pooley; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Michel P. Schammel; Anna M. M. Scaife; Paul F. Scott; Timothy Shimwell; David Titterington; Elizabeth Waldram
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We present follow-up observations of two galaxy clusters detected blindly via the Sunyaev-Zel'dovich (SZ) effect and released in the Planck Early Release Compact Source Catalogue. We use the Arcminute Microkelvin Imager, a dual-array 14-18 GHz radio interferometer. After radio source subtraction, we find a SZ decrement of integrated flux density -1.08+/-0.10 mJy toward PLCKESZ G121.11+57.01, and improve the position measurement of the cluster, finding the centre to be RA 12 59 36.4, Dec +60 04...
Source: http://arxiv.org/abs/1103.0947v2
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37
Jul 20, 2013
07/13
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Ricardo Genova-Santos; Jose Alberto Rubino-Martin; Rafael Rebolo; Richard A. Battye; Francisco Blanco; Rod D. Davies; Richard J. Davis; Thomas Franzen; Keith Grainge; Michael P. Hobson; Anthony Lasenby; Carmen P. Padilla-Torres; Guy G. Pooley; Richard D. E. Saunders; Anna Scaife; Paul F. Scott; David Titterington; Marco Tucci; Robert A. Watson
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We present interferometric imaging at 33 GHz, with the new superextended configuration of the Very Small Array (VSA), of a very deep decrement in the cosmic microwave background (CMB) temperature. This decrement is located in the direction of the Corona Borealis supercluster, at a position with no known galaxy clusters, and was discovered by a previous VSA survey (Genova-Santos et al.). A total area of 3 sq.deg. has now been imaged, with an angular resolution of 7 arcmin and a flux sensitivity...
Source: http://arxiv.org/abs/0804.0199v1
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51
Sep 22, 2013
09/13
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Anna M. M. Scaife; Natasha Hurley-Walker; David A. Green; Matthew L. Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Anthony N. Lasenby; Guy G. Pooley; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram; Jonathan T. L. Zwart
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Observations at 14.2 to 17.9 GHz made with the AMI Small Array towards fourteen Lynds Dark Nebulae with a resolution of 2' are reported. These sources are selected from the SCUBA observations of Visser et al. (2001) as small angular diameter clouds well matched to the synthesized beam of the AMI Small Array. Comparison of the AMI observations with radio observations at lower frequencies with matched uv-plane coverage is made, in order to search for any anomalous excess emission which can be...
Source: http://arxiv.org/abs/0908.1655v1
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69
Sep 20, 2013
09/13
by
The AMI Consortium; :; Carmen Rodríguez-Gonzálvez; Timothy W. Shimwell; Matthew L. Davies; Farhan Feroz; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Guy Pooley; Richard D. E. Saunders; Anna M. M. Scaife; Michel P. Schammel; Paul F. Scott; David J. Titterington; Elizabeth M. Waldram
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We present 16-GHz AMI SZ observations of 19 clusters with L_X >7x10^37 W (h50=1) selected from the LoCuS survey (0.142
Source: http://arxiv.org/abs/1205.7067v1
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48
Sep 22, 2013
09/13
by
The AMI Consortium; :; Timothy W. Shimwell; Carmen Rodriguez-Gonzalvez; Matthew L. Davies; Farhan Feroz; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Guy Pooley; Richard D. E. Saunders; Anna M. M. Scaife; Michel P. Schammel; Paul F. Scott; David J. Titterington; Elizabeth M. Waldram
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We present observations from the Small Array of the Arcminute Microkelvin Imager (AMI) of eight high X-ray luminosity galaxy cluster systems selected from the Local Cluster Substructure Survey (LoCuSS) sample.We detect the Sunyaev-Zel'dovich (SZ) effect in seven of these clusters. With the assumptions that galaxy clusters are isothermal, have a density profile described by a spherical b -model and obey the theoretical M-T relation, we are able to derive cluster parameters at r200 from our SZ...
Source: http://arxiv.org/abs/1101.5590v1
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29
Sep 23, 2013
09/13
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Thomas M. O. Franzen; Matthew L. Davies; Elizabeth M. Waldram; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony Lasenby; Malak Olamaie; Guy G. Pooley; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Anna M. M. Scaife; Michel P. Schammel; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Jonathan T. L. Zwart
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We have observed an area of approximatley 27 deg^2 to an rms noise level of less than 0.2 mJy at 15.7 GHz, using the Arcminute Microkelvin Imager Large Array. These observations constitute the most sensitive radio-source survey of any extent (greater than approximately 0.2 deg^2) above 1.4 GHz. This paper presents the techniques employed for observing, mapping and source extraction. We have used a systematic procedure for extracting information and producing source catalogues, from maps with...
Source: http://arxiv.org/abs/1012.3711v2
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37
Sep 23, 2013
09/13
by
AMI Consortium; :; Yvette C. Perrott; David A. Green; Matthew L. Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Guy G. Pooley; Carmen Rodríguez-Gonzálvez; Richard D. E. Saunders; Anna M. M. Scaife; Michel P. Schammel; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram
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The Planck Early Release Compact Source Catalogue includes 26 sources with no obvious matches in other radio catalogues (of primarily extragalactic sources). Here we present observations made with the Arcminute Microkelvin Imager Small Array (AMI SA) at 15.75 GHz of the eight of the unmatched sources at declination > +10 degrees. Of the eight, four are detected and are associated with known objects. The other four are not detected with the AMI SA, and are thought to be spurious.
Source: http://arxiv.org/abs/1110.1454v2
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Sep 23, 2013
09/13
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The AMI Consortium; :; Malak Olamaie; Carmen Rodriguez-Gonzalvez; Matthew L. Davies; Farhan Feroz; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Guy G. Pooley; Richard D. E. Saunders; Anna M. M. Scaife; Michel Schammel; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram; Jonathan T. L. Zwart
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Most Sunyaev--Zel'dovich (SZ) and X-ray analyses of galaxy clusters try to constrain the cluster total mass and/or gas mass using parameterised models and assumptions of spherical symmetry and hydrostatic equilibrium. By numerically exploring the probability distributions of the cluster parameters given the simulated interferometric SZ data in the context of Bayesian methods, and assuming a beta-model for the electron number density we investigate the capability of this model and analysis to...
Source: http://arxiv.org/abs/1012.4996v2
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Sep 21, 2013
09/13
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Jonathan T. L. Zwart; Farhan Feroz; Matthew L. Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Ruediger Kneissl; Anthony N. Lasenby; Malak Olamaie; Guy G. Pooley; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Anna M. M. Scaife; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram
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We present observations using the Small Array of the Arcminute Microkelvin Imager (AMI; 14-18 GHz) of four Abell and three MACS clusters spanning 0.171-0.686 in redshift. We detect Sunyaev-Zel'dovich (SZ) signals in five of these without any attempt at source subtraction, although strong source contamination is present. With radio-source measurements from high-resolution observations, and under the assumptions of spherical $\beta$-model, isothermality and hydrostatic equilibrium, a Bayesian...
Source: http://arxiv.org/abs/1008.0443v2
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Sep 22, 2013
09/13
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Anna M. M. Scaife; Bojan Nikolic; David A. Green; Rainer Beck; Matthew L. Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Guy G. Pooley; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram; Jonathan T. L. Zwart
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We report new cm-wave measurements at five frequencies between 15 and 18GHz of the continuum emission from the reportedly anomalous "region 4" of the nearby galaxy NGC6946. We find that the emission in this frequency range is significantly in excess of that measured at 8.5GHz, but has a spectrum from 15-18GHz consistent with optically thin free-free emission from a compact HII region. In combination with previously published data we fit four emission models containing different...
Source: http://arxiv.org/abs/1004.4897v1
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25
Sep 19, 2013
09/13
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Anna M. M. Scaife; David A. Green; Guy G. Pooley; Matthew L. Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; John S. Richer; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram; Jonathan T. L. Zwart
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We present 25 arcsecond resolution radio images of five Lynds Dark Nebulae (L675, L944, L1103, L1111 & L1246) at 16 GHz made with the Arcminute Microkelvin Imager (AMI) Large Array. These objects were previously observed with the AMI Small Array to have an excess of emission at microwave frequencies relative to lower frequency radio data. In L675 we find a flat spectrum compact radio counterpart to the 850 micron emission seen with SCUBA and suggest that it is cm-wave emission from a...
Source: http://arxiv.org/abs/0910.4011v2
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Sep 23, 2013
09/13
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Matthew L. Davies; Thomas M. O. Franzen; Elizabeth M. Waldram; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony Lasenby; Malak Olamaie; Guy G. Pooley; Julia M. Riley; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Anna M. M. Scaife; Michel P. Schammel; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Jonathan T. L. Zwart
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The first results from the Tenth Cambridge (10C) Survey of Radio Sources, carried out using the AMI Large Array (LA) at an observing frequency of 15.7 GHz, are presented. The survey fields cover an area of approximately 27 sq. degrees to a flux-density completeness of 1 mJy. Results for some deeper areas, covering approximately 12 sq. degrees, wholly contained within the total areas and complete to 0.5 mJy, are also presented. The completeness for both areas is estimated to be at least 93 per...
Source: http://arxiv.org/abs/1012.3659v2
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Sep 22, 2013
09/13
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Anna Scaife; David A. Green; Richard A. Battye; Rod D. Davies; Richard J. Davis; Clive Dickinson; Thomas Franzen; Ricardo Genova-Santos; Keith Grainge; Yaser A. Hafez; Michael P. Hobson; Anthony Lasenby; Guy G. Pooley; Nutan Rajguru; Rafael Rebolo; Jose Alberto Rubino-Martin; Richard D. E. Saunders; Paul F. Scott; David Titterington; Elizabeth Waldram; Robert A. Watson
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We present results from observations made at 33 GHz with the Very Small Array (VSA) telescope towards potential candidates in the Galactic plane for spinning dust emission. In the cases of the diffuse HII regions LPH96 and NRAO591 we find no evidence for anomalous emission and, in combination with Effelsberg data at 1.4 and 2.7 GHz, confirm that their spectra are consistent with optically thin free--free emission. In the case of the infra-red bright SNR 3C396 we find emission inconsistent with...
Source: http://arxiv.org/abs/astro-ph/0702473v1
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Sep 22, 2013
09/13
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Natasha Hurley-Walker; Sarah Bridle; Eduardo S. Cypriano; Matthew L. Davies; Thomas Erben; Farhan Feroz; Thomas M. O. Franzen; Keith Grainge; Michael P. Hobson; Anthony Lasenby; P. J. Marshall; Malak Olamaie; Guy Pooley; Carmen Rodríguez-Gonzálvez; Richard D. E. Saunders; Anna M. M. Scaife; Michel P. Schammel; Paul F. Scott; Timothy Shimwell; David Titterington; Elizabeth Waldram; Jonathan T. L. Zwart
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We present an analysis of observations made with the Arcminute Microkelvin Imager (AMI) and the Canada-France-Hawaii Telescope (CFHT) of six galaxy clusters in a redshift range of 0.16--0.41. The cluster gas is modelled using the Sunyaev--Zel'dovich (SZ) data provided by AMI, while the total mass is modelled using the lensing data from the CFHT. In this paper, we: i) find very good agreement between SZ measurements (assuming large-scale virialisation and a gas-fraction prior) and lensing...
Source: http://arxiv.org/abs/1101.5912v3
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Sep 23, 2013
09/13
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Anna M. M. Scaife; Jennifer Hatchell; Rachael E. Ainsworth; Jane V. Buckle; Matthew Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Yvette C. Perrott; Guy G. Pooley; John S. Richer; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Michel P. Schammel; Paul F. Scott; Timothy Shimwell; David Titterington; Elizabeth Waldram
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We present deep radio continuum observations of the cores identified as deeply embedded young stellar objects in the Serpens molecular cloud by the Spitzer c2d programme at a wavelength of 1.8cm with the Arcminute Microkelvin Imager Large Array (AMI-LA). These observations have a resolution of ~30arcsec and an average sensitivity of 19microJy/beam. The targets are predominantly Class I sources, and we find the detection rate for Class I objects in this sample to be low (18%) compared to that of...
Source: http://arxiv.org/abs/1110.0941v1
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Jul 20, 2013
07/13
by
Yaser A. Hafez; Rod D. Davies; Richard J. Davis; Clive Dickinson; Elia S. Battistelli; Francisco Blanco; Kieran Cleary; Thomas Franzen; Ricardo Genova-Santos; Keith Grainge; Michael P. Hobson; Michael E. Jones; Katy Lancaster; Anthony N. Lasenby; Carmen P. Padilla-Torres; Jose Alberto Rubino-Martin; Rafael Rebolo; Richard D. E. Saunders; Paul F. Scott; Angela C. Taylor; David Titterington; Marco Tucci; Robert A. Watson
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Accurate calibration of data is essential for the current generation of CMB experiments. Using data from the Very Small Array (VSA), we describe procedures which will lead to an accuracy of 1 percent or better for experiments such as the VSA and CBI. Particular attention is paid to the stability of the receiver systems, the quality of the site and frequent observations of reference sources. At 30 GHz the careful correction for atmospheric emission and absorption is shown to be essential for...
Source: http://arxiv.org/abs/0804.2853v1
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47
Sep 23, 2013
09/13
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Anna M. M. Scaife; Jane V. Buckle; Rachael E. Ainsworth; Matthew Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Yvette C. Perrott; Guy G. Pooley; Tom P. Ray; John S. Richer; Carmen Rodriguez-Gonzalvez; Richard D. E. Saunders; Michel P. Schammel; Paul F. Scott; Timothy Shimwell; David Titterington; Elizabeth Waldram
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We present deep 1.8 cm (16 GHz) radio continuum imaging of seven young stellar objects in the Taurus molecular cloud. These objects have previously been extensively studied in the sub-mm to NIR range and their SEDs modelled to provide reliable physical and geometrical parametres.We use this new data to constrain the properties of the long-wavelength tail of the greybody spectrum, which is expected to be dominated by emission from large dust grains in the protostellar disk. We find spectra...
Source: http://arxiv.org/abs/1111.5184v1
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31
Sep 22, 2013
09/13
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Paul F. Scott; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard Davis; Clive Dickinson; Keith Grainge; Carlos Gutierrez; Michael P. Hobson; Michael E. Jones; Ruediger Kneissl; Anthony Lasenby; Klaus Maisinger; Guy Pooley; Rafael Rebolo; Jose Alberto Rubino Martin; Pedro Sosa Molina; Ben Rusholme; Richard Saunders; Richard Savage; Anze Slosar; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson; Althea Wilkinson
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We present the power spectrum of the fluctuations in the cosmic microwave background detected by the Very Small Array (VSA) in its first season of observations in its compact configuration. We find clear detections of first and second acoustic peaks at l~200 and l~550, plus detection of power on scales up to l=800. The VSA power spectrum is in very good agreement with the results of the Boomerang, Dasi and Maxima telescopes despite the differing potential systematic errors.
Source: http://arxiv.org/abs/astro-ph/0205380v3
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52
Sep 21, 2013
09/13
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Carmen Rodriguez-Gonzalvez; Malak Olamaie; Matthew L. Davies; Andy C. Fabian; Farhan Feroz; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Guy G. Pooley; Helen R. Russell; Jeremy S. Sanders; Richard D. E. Saunders; Anna M. M. Scaife; Michel P. Schammel; Paul F. Scott; Timothy W. Shimwell; David J. Titterington; Elizabeth M. Waldram; Jonathan T. L. Zwart
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We present 13.9-18.2 GHz observations of the Sunyaev-Zel'dovich (SZ) effect towards Abell 2146 using the Arcminute Microkelvin Imager (AMI). The cluster is detected with a peak SNR ratio of 13 sigma in the radio source subtracted map. Comparison of the SZ and X-ray images suggests that they both have extended regions which lie approximately perpendicular to one another, with their emission peaks significantly displaced. These features indicate non-uniformities in the distributions of the gas...
Source: http://arxiv.org/abs/1011.0325v2
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66
Jul 20, 2013
07/13
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AMI Consortium; :; Rachael E. Ainsworth; Anna M. M. Scaife; Tom P. Ray; Jane V. Buckle; Matthew Davies; Thomas M. O. Franzen; Keith J. B. Grainge; Michael P. Hobson; Natasha Hurley-Walker; Anthony N. Lasenby; Malak Olamaie; Yvette C. Perrott; Guy G. Pooley; John S. Richer; Carmen Rodriguez-Gonzalvez; Michel P. Schammel; Paul F. Scott; Timothy Shimwell; Richard D. E. Saunders; David Titterington; Elizabeth Waldram
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We present 16 GHz (1.9 cm) deep radio continuum observations made with the Arcminute Microkelvin Imager (AMI) of a sample of low-mass young stars driving jets. We combine these new data with archival information from an extensive literature search to examine spectral energy distributions (SEDs) for each source and calculate both the radio and sub-mm spectral indices in two different scenarios: (1) fixing the dust temperature (Td) according to evolutionary class; (2) allowing Td to vary. We use...
Source: http://arxiv.org/abs/1203.3381v1
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30
Sep 22, 2013
09/13
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Robert A. Watson; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Keith Grainge; Carlos M. Gutierrez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Anthony Lasenby; Klaus Maisinger; Guy G. Pooley; Rafael Rebolo; Jose Alberto Rubino-Martin; Ben Rusholme; Richard D. E. Saunders; Richard Savage; Paul F. Scott; Anze Slosar; Pedro J. Sosa Molina; Angela C. Taylor; David Titterington; Elizabeth Waldram; Althea Wilkinson
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The Very Small Array (VSA) is a synthesis telescope designed to image faint structures in the cosmic microwave background on degree and sub-degree angular scales. The VSA has key differences from other CMB interferometers with the result that different systematic errors are expected. We have tested the operation of the VSA with a variety of blank-field and calibrator observations and cross-checked its calibration scale against independent measurements. We find that systematic effects can be...
Source: http://arxiv.org/abs/astro-ph/0205378v2
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49
Sep 24, 2013
09/13
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Jose Alberto Rubino-Martin; Rafael Rebolo; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Keith Grainge; Carlos M. Gutierrez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Anthony Lasenby; Klaus Maisinger; Carolina Oedman; Guy G. Pooley; Pedro J. Sosa Molina; Ben Rusholme; Richard D. E. Saunders; Richard Savage; Paul F. Scott; Anze Slosar; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson; Althea Wilkinson
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We investigate the constraints on basic cosmological parameters set by the first compact-configuration observations of the Very Small Array (VSA), and other cosmological data sets, in the standard inflationary LambdaCDM model. Using a weak prior 40 < H_0 < 90 km/s/Mpc and 0 < tau < 0.5 we find that the VSA and COBE_DMR data alone produce the constraints Omega_tot = 1.03^{+0.12}_{-0.12}, Omega_bh^2 = 0.029^{+0.009}_{-0.009}, Omega_cdm h^2 = 0.13^{+0.08}_{-0.05} and n_s =...
Source: http://arxiv.org/abs/astro-ph/0205367v2
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41
Sep 22, 2013
09/13
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Angela C. Taylor; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Keith Grainge; Carlos M. Gutierrez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Guy G. Pooley; Rafael Rebolo; Jose Alberto Rubino-Martin; Ben Rusholme; Richard D. E. Saunders; Richard Savage; Paul F. Scott; Anze Slosar; Pedro J. Sosa Molina; David Titterington; Elizabeth Waldram; Robert A. Watson; Althea Wilkinson
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We have observed the cosmic microwave background temperature fluctuations in eight fields covering three separated areas of sky with the Very Small Array at 34 GHz. A total area of 101 square degrees has been imaged, with sensitivity on angular scales 3.6 - 0.4 degrees (equivalent to angular multipoles l=150-900). We describe the field selection and observing strategy for these observations. In the full-resolution images (with synthesised beam of FWHM ~ 17 arcmin) the thermal noise is typically...
Source: http://arxiv.org/abs/astro-ph/0205381v2
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42
Sep 18, 2013
09/13
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Keith Grainge; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Ricardo Genova-Santos; Carlos M. Gutierrez; Yaser A. Hafez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Katy Lancaster; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Guy G. Pooley; Rafael Rebolo; Jose Alberto Rubino-Martin; Pedro Sosa Molina; Carolina Odman; Ben Rusholme; Richard D. E. Saunders; Richard Savage; Paul F. Scott; Anze Slosar; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson; Althea Wilkinson
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We have observed the cosmic microwave background (CMB) in three regions of sky using the Very Small Array (VSA) in an extended configuration with antennas of beamwidth 2 degrees at 34 GHz. Combined with data from previous VSA observations using a more compact array with larger beamwidth, we measure the power spectrum of the primordial CMB anisotropies between angular multipoles l = 160 - 1400. Such measurements at high l are vital for breaking degeneracies in parameter estimation from the CMB...
Source: http://arxiv.org/abs/astro-ph/0212495v2
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48
Sep 22, 2013
09/13
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Richard Savage; Richard A. Battye; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Ricardo Genova-Santos; Keith Grainge; Carlos M. Gutierrez; Yaser A. Hafez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Katy Lancaster; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Guy G. Pooley; Nutan Rajguru; Rafael Rebolo; Graca Rocha; Jose Alberto Rubino-Martin; Pedro Sosa Molina; Richard D. E. Saunders; Paul Scott; Anze Slosar; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson
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We have tested Very Small Array (VSA) observations of three regions of sky for the presence of non-Gaussianity, using high-order cumulants, Minkowski functionals, a wavelet-based test and a Bayesian joint power spectrum/non-Gaussianity analysis. We find the data from two regions to be consistent with Gaussianity. In the third region, we obtain a 96.7% detection of non-Gaussianity using the wavelet test. We perform simulations to characterise the tests, and conclude that this is consistent with...
Source: http://arxiv.org/abs/astro-ph/0308266v2
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37
Sep 21, 2013
09/13
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Rafael Rebolo; Richard A. Battye; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Ricardo Genova-Santos; Keith Grainge; Carlos M. Gutirrez; Yaser A. Hafez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Katy Lancaster; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Guy G. Pooley; Nutan Rajguru; Jose Alberto Rubino-Martin; Richard D. E. Saunders; Richard S. Savage; Anna Scaife; Paul F. Scott; Anze Slosar; Pedro Sosa Molina; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson; Althea Wilkinson
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We estimate cosmological parameters using data obtained by the Very Small Array (VSA) in its extended configuration, in conjunction with a variety of other CMB data and external priors. Within the flat $\Lambda$CDM model, we find that the inclusion of high resolution data from the VSA modifies the limits on the cosmological parameters as compared to those suggested by WMAP alone, while still remaining compatible with their estimates. We find that $\Omega_{\rm b}h^2=0.0234^{+0.0012}_{-0.0014}$,...
Source: http://arxiv.org/abs/astro-ph/0402466v2
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49
Sep 18, 2013
09/13
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Anze Slosar; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Ricardo Genova-Santos; Keith Grainge; Carlos M. Gutierrez; Yaser A. Hafez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Katy Lancaster; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Phil J. Marshall; Guy G. Pooley; Rafael Rebolo; Jose Alberto Rubino-Martin; Ben Rusholme; Richard D. E. Saunders; Richard Savage; Paul F. Scott; Pedro J. Sosa Molina; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson; Althea Wilkinson
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We constrain the basic comological parameters using the first observations by the Very Small Array (VSA) in its extended configuration, together with existing cosmic microwave background data and other cosmological observations. We estimate cosmological parameters for four different models of increasing complexity. In each case, careful consideration is given to implied priors and the Bayesian evidence is calculated in order to perform model selection. We find that the data are most...
Source: http://arxiv.org/abs/astro-ph/0212497v2
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56
Sep 21, 2013
09/13
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Clive Dickinson; Richard A. Battye; Kieran Cleary; Rod D. Davies; Richard J. Davis; Ricardo Genova-Santos; Keith Grainge; Carlos M. Gutierrez; Yaser A. Hafez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Katy Lancaster; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Carolina Odman; Guy Pooley; Nutan Rajguru; Rafael Rebolo; Jose Alberto Rubino-Martin; Richard D. E. Saunders; Richard S. Savage; Anna Scaife; Paul F. Scott; Anze Slosar; Pedro Sosa Molina; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson; Althea Wilkinson
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We present deep Ka-band ($\nu \approx 33$ GHz) observations of the CMB made with the extended Very Small Array (VSA). This configuration produces a naturally weighted synthesized FWHM beamwidth of $\sim 11$ arcmin which covers an $\ell$-range of 300 to 1500. On these scales, foreground extragalactic sources can be a major source of contamination to the CMB anisotropy. This problem has been alleviated by identifying sources at 15 GHz with the Ryle Telescope and then monitoring these sources at...
Source: http://arxiv.org/abs/astro-ph/0402498v2
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59
Sep 18, 2013
09/13
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Sarah Smith; Graca Rocha; Anthony Challinor; Richard A. Battye; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Ricardo Genova-Santos; Keith Grainge; Carlos M. Gutierrez; Yaser A. Hafez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Katy Lancaster; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Guy G. Pooley; Nutan Rajguru; Rafael Rebolo; Jose Alberto Rubino-Martin; Pedro Sosa Molina; Richard D. E. Saunders; Richard S. Savage; Paul Scott; Anze Slosar; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson
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We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in December 2002, and compare our results to those obtained from Gaussian simulations. There is a slight excess of large bispectrum values for two individual fields, but this does not appear when the fields are combined. Given our expected level of residual point sources, we do not expect these to be the source of the discrepancy. Using the compact configuration data, we put...
Source: http://arxiv.org/abs/astro-ph/0401618v2
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97
Jul 20, 2013
07/13
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Jose Alberto Rubino-Martin; Antonio M. Aliaga; R. B. Barreiro; Richard A. Battye; Pedro Carreira; Kieran Cleary; Rod D. Davies; Richard J. Davis; Clive Dickinson; Ricardo Genova-Santos; Keith Grainge; Carlos M. Gutierrez; Yaser A. Hafez; Michael P. Hobson; Michael E. Jones; Rudiger Kneissl; Katy Lancaster; Anthony Lasenby; J. P. Leahy; Klaus Maisinger; Enrique Martinez-Gonzalez; Guy G. Pooley; Nutan Rajguru; Rafael Rebolo; Jose Luis Sanz; Richard D. E. Saunders; Richard S. Savage; Anna Scaife; Paul Scott; Anze Slosar; Angela C. Taylor; David Titterington; Elizabeth Waldram; Robert A. Watson
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(Abridged) We have used the Rayner & Best (1989) smooth tests of goodness-of-fit to study the Gaussianity of the Very Small Array (VSA) data. Out of the 41 published VSA individual pointings dedicated to cosmological observations, 37 are found to be consistent with Gaussianity, whereas four pointings show deviations from Gaussianity. In two of them, these deviations can be explained as residual systematic effects of a few visibility points which, when corrected, have a negligible impact on...
Source: http://arxiv.org/abs/astro-ph/0604070v1
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120
Nov 4, 2011
11/11
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Jack, Ian, 1945- edt; Hamilton-Paterson, James. Sea burial; Jack, Ian, 1945- Serendip; Rosie, George. Northern light; Pamuk, Orhan, 1952- Boy who watched the ships go by; Gaumy, Jean. Hunters; Webster, Justin, 1963- Piratas; Nicholl, Charles. Conversations with a giant; Theroux, Paul. Unspeakable rituals; Blackburn, Julia. Mermaid; Scammell, William, 1939- Sea pictures; Bathurst, Bella. Sea pictures; Ascherson, Neal. Sea pictures; Rodger, N. A. M., 1949- Sea pictures; Hobson, Will. Sea pictures; Ackerman, Michael, 1967- New York waterfront; Marsden, Philip, 1961- Waiting for St. Petersburg; Gill, Stephen, 1971- Scotland's last great artefact; Murakami, Haruki, 1949- Seventh man; Drewe, Robert, 1943- News shark; Biguenet, John. And never come up
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